880dbe2e6f94979847df154fb0a35e4ed964df69
[linux-2.6.git] / net / wireless / core.c
1 /*
2  * This is the linux wireless configuration interface.
3  *
4  * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
5  */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/if.h>
10 #include <linux/module.h>
11 #include <linux/err.h>
12 #include <linux/list.h>
13 #include <linux/slab.h>
14 #include <linux/nl80211.h>
15 #include <linux/debugfs.h>
16 #include <linux/notifier.h>
17 #include <linux/device.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/sched.h>
21 #include <net/genetlink.h>
22 #include <net/cfg80211.h>
23 #include "nl80211.h"
24 #include "core.h"
25 #include "sysfs.h"
26 #include "debugfs.h"
27 #include "wext-compat.h"
28 #include "ethtool.h"
29
30 /* name for sysfs, %d is appended */
31 #define PHY_NAME "phy"
32
33 MODULE_AUTHOR("Johannes Berg");
34 MODULE_LICENSE("GPL");
35 MODULE_DESCRIPTION("wireless configuration support");
36
37 /* RCU-protected (and cfg80211_mutex for writers) */
38 LIST_HEAD(cfg80211_rdev_list);
39 int cfg80211_rdev_list_generation;
40
41 DEFINE_MUTEX(cfg80211_mutex);
42
43 /* for debugfs */
44 static struct dentry *ieee80211_debugfs_dir;
45
46 /* for the cleanup, scan and event works */
47 struct workqueue_struct *cfg80211_wq;
48
49 static bool cfg80211_disable_40mhz_24ghz;
50 module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
51 MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
52                  "Disable 40MHz support in the 2.4GHz band");
53
54 /* requires cfg80211_mutex to be held! */
55 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
56 {
57         struct cfg80211_registered_device *result = NULL, *rdev;
58
59         if (!wiphy_idx_valid(wiphy_idx))
60                 return NULL;
61
62         assert_cfg80211_lock();
63
64         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
65                 if (rdev->wiphy_idx == wiphy_idx) {
66                         result = rdev;
67                         break;
68                 }
69         }
70
71         return result;
72 }
73
74 int get_wiphy_idx(struct wiphy *wiphy)
75 {
76         struct cfg80211_registered_device *rdev;
77         if (!wiphy)
78                 return WIPHY_IDX_STALE;
79         rdev = wiphy_to_dev(wiphy);
80         return rdev->wiphy_idx;
81 }
82
83 /* requires cfg80211_rdev_mutex to be held! */
84 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
85 {
86         struct cfg80211_registered_device *rdev;
87
88         if (!wiphy_idx_valid(wiphy_idx))
89                 return NULL;
90
91         assert_cfg80211_lock();
92
93         rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
94         if (!rdev)
95                 return NULL;
96         return &rdev->wiphy;
97 }
98
99 /* requires cfg80211_mutex to be held! */
100 struct cfg80211_registered_device *
101 __cfg80211_rdev_from_info(struct genl_info *info)
102 {
103         int ifindex;
104         struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;
105         struct net_device *dev;
106         int err = -EINVAL;
107
108         assert_cfg80211_lock();
109
110         if (info->attrs[NL80211_ATTR_WIPHY]) {
111                 bywiphyidx = cfg80211_rdev_by_wiphy_idx(
112                                 nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
113                 err = -ENODEV;
114         }
115
116         if (info->attrs[NL80211_ATTR_IFINDEX]) {
117                 ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
118                 dev = dev_get_by_index(genl_info_net(info), ifindex);
119                 if (dev) {
120                         if (dev->ieee80211_ptr)
121                                 byifidx =
122                                         wiphy_to_dev(dev->ieee80211_ptr->wiphy);
123                         dev_put(dev);
124                 }
125                 err = -ENODEV;
126         }
127
128         if (bywiphyidx && byifidx) {
129                 if (bywiphyidx != byifidx)
130                         return ERR_PTR(-EINVAL);
131                 else
132                         return bywiphyidx; /* == byifidx */
133         }
134         if (bywiphyidx)
135                 return bywiphyidx;
136
137         if (byifidx)
138                 return byifidx;
139
140         return ERR_PTR(err);
141 }
142
143 struct cfg80211_registered_device *
144 cfg80211_get_dev_from_info(struct genl_info *info)
145 {
146         struct cfg80211_registered_device *rdev;
147
148         mutex_lock(&cfg80211_mutex);
149         rdev = __cfg80211_rdev_from_info(info);
150
151         /* if it is not an error we grab the lock on
152          * it to assure it won't be going away while
153          * we operate on it */
154         if (!IS_ERR(rdev))
155                 mutex_lock(&rdev->mtx);
156
157         mutex_unlock(&cfg80211_mutex);
158
159         return rdev;
160 }
161
162 struct cfg80211_registered_device *
163 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
164 {
165         struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
166         struct net_device *dev;
167
168         mutex_lock(&cfg80211_mutex);
169         dev = dev_get_by_index(net, ifindex);
170         if (!dev)
171                 goto out;
172         if (dev->ieee80211_ptr) {
173                 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
174                 mutex_lock(&rdev->mtx);
175         } else
176                 rdev = ERR_PTR(-ENODEV);
177         dev_put(dev);
178  out:
179         mutex_unlock(&cfg80211_mutex);
180         return rdev;
181 }
182
183 /* requires cfg80211_mutex to be held */
184 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
185                         char *newname)
186 {
187         struct cfg80211_registered_device *rdev2;
188         int wiphy_idx, taken = -1, result, digits;
189
190         assert_cfg80211_lock();
191
192         /* prohibit calling the thing phy%d when %d is not its number */
193         sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
194         if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
195                 /* count number of places needed to print wiphy_idx */
196                 digits = 1;
197                 while (wiphy_idx /= 10)
198                         digits++;
199                 /*
200                  * deny the name if it is phy<idx> where <idx> is printed
201                  * without leading zeroes. taken == strlen(newname) here
202                  */
203                 if (taken == strlen(PHY_NAME) + digits)
204                         return -EINVAL;
205         }
206
207
208         /* Ignore nop renames */
209         if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
210                 return 0;
211
212         /* Ensure another device does not already have this name. */
213         list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
214                 if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
215                         return -EINVAL;
216
217         result = device_rename(&rdev->wiphy.dev, newname);
218         if (result)
219                 return result;
220
221         if (rdev->wiphy.debugfsdir &&
222             !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
223                             rdev->wiphy.debugfsdir,
224                             rdev->wiphy.debugfsdir->d_parent,
225                             newname))
226                 pr_err("failed to rename debugfs dir to %s!\n", newname);
227
228         nl80211_notify_dev_rename(rdev);
229
230         return 0;
231 }
232
233 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
234                           struct net *net)
235 {
236         struct wireless_dev *wdev;
237         int err = 0;
238
239         if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
240                 return -EOPNOTSUPP;
241
242         list_for_each_entry(wdev, &rdev->netdev_list, list) {
243                 wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
244                 err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
245                 if (err)
246                         break;
247                 wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
248         }
249
250         if (err) {
251                 /* failed -- clean up to old netns */
252                 net = wiphy_net(&rdev->wiphy);
253
254                 list_for_each_entry_continue_reverse(wdev, &rdev->netdev_list,
255                                                      list) {
256                         wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
257                         err = dev_change_net_namespace(wdev->netdev, net,
258                                                         "wlan%d");
259                         WARN_ON(err);
260                         wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
261                 }
262
263                 return err;
264         }
265
266         wiphy_net_set(&rdev->wiphy, net);
267
268         err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
269         WARN_ON(err);
270
271         return 0;
272 }
273
274 static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
275 {
276         struct cfg80211_registered_device *rdev = data;
277
278         rdev->ops->rfkill_poll(&rdev->wiphy);
279 }
280
281 static int cfg80211_rfkill_set_block(void *data, bool blocked)
282 {
283         struct cfg80211_registered_device *rdev = data;
284         struct wireless_dev *wdev;
285
286         if (!blocked)
287                 return 0;
288
289         rtnl_lock();
290         mutex_lock(&rdev->devlist_mtx);
291
292         list_for_each_entry(wdev, &rdev->netdev_list, list)
293                 dev_close(wdev->netdev);
294
295         mutex_unlock(&rdev->devlist_mtx);
296         rtnl_unlock();
297
298         return 0;
299 }
300
301 static void cfg80211_rfkill_sync_work(struct work_struct *work)
302 {
303         struct cfg80211_registered_device *rdev;
304
305         rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
306         cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
307 }
308
309 static void cfg80211_event_work(struct work_struct *work)
310 {
311         struct cfg80211_registered_device *rdev;
312
313         rdev = container_of(work, struct cfg80211_registered_device,
314                             event_work);
315
316         rtnl_lock();
317         cfg80211_lock_rdev(rdev);
318
319         cfg80211_process_rdev_events(rdev);
320         cfg80211_unlock_rdev(rdev);
321         rtnl_unlock();
322 }
323
324 /* exported functions */
325
326 struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
327 {
328         static int wiphy_counter;
329
330         struct cfg80211_registered_device *rdev;
331         int alloc_size;
332
333         WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
334         WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
335         WARN_ON(ops->connect && !ops->disconnect);
336         WARN_ON(ops->join_ibss && !ops->leave_ibss);
337         WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
338         WARN_ON(ops->add_station && !ops->del_station);
339         WARN_ON(ops->add_mpath && !ops->del_mpath);
340         WARN_ON(ops->join_mesh && !ops->leave_mesh);
341
342         alloc_size = sizeof(*rdev) + sizeof_priv;
343
344         rdev = kzalloc(alloc_size, GFP_KERNEL);
345         if (!rdev)
346                 return NULL;
347
348         rdev->ops = ops;
349
350         mutex_lock(&cfg80211_mutex);
351
352         rdev->wiphy_idx = wiphy_counter++;
353
354         if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
355                 wiphy_counter--;
356                 mutex_unlock(&cfg80211_mutex);
357                 /* ugh, wrapped! */
358                 kfree(rdev);
359                 return NULL;
360         }
361
362         mutex_unlock(&cfg80211_mutex);
363
364         /* give it a proper name */
365         dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
366
367         mutex_init(&rdev->mtx);
368         mutex_init(&rdev->devlist_mtx);
369         mutex_init(&rdev->sched_scan_mtx);
370         INIT_LIST_HEAD(&rdev->netdev_list);
371         spin_lock_init(&rdev->bss_lock);
372         INIT_LIST_HEAD(&rdev->bss_list);
373         INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
374         INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
375 #ifdef CONFIG_CFG80211_WEXT
376         rdev->wiphy.wext = &cfg80211_wext_handler;
377 #endif
378
379         device_initialize(&rdev->wiphy.dev);
380         rdev->wiphy.dev.class = &ieee80211_class;
381         rdev->wiphy.dev.platform_data = rdev;
382
383 #ifdef CONFIG_CFG80211_DEFAULT_PS
384         rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
385 #endif
386
387         wiphy_net_set(&rdev->wiphy, &init_net);
388
389         rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
390         rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
391                                    &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
392                                    &rdev->rfkill_ops, rdev);
393
394         if (!rdev->rfkill) {
395                 kfree(rdev);
396                 return NULL;
397         }
398
399         INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
400         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
401         INIT_WORK(&rdev->event_work, cfg80211_event_work);
402
403         init_waitqueue_head(&rdev->dev_wait);
404
405         /*
406          * Initialize wiphy parameters to IEEE 802.11 MIB default values.
407          * Fragmentation and RTS threshold are disabled by default with the
408          * special -1 value.
409          */
410         rdev->wiphy.retry_short = 7;
411         rdev->wiphy.retry_long = 4;
412         rdev->wiphy.frag_threshold = (u32) -1;
413         rdev->wiphy.rts_threshold = (u32) -1;
414         rdev->wiphy.coverage_class = 0;
415
416         return &rdev->wiphy;
417 }
418 EXPORT_SYMBOL(wiphy_new);
419
420 static int wiphy_verify_combinations(struct wiphy *wiphy)
421 {
422         const struct ieee80211_iface_combination *c;
423         int i, j;
424
425         /* If we have combinations enforce them */
426         if (wiphy->n_iface_combinations)
427                 wiphy->flags |= WIPHY_FLAG_ENFORCE_COMBINATIONS;
428
429         for (i = 0; i < wiphy->n_iface_combinations; i++) {
430                 u32 cnt = 0;
431                 u16 all_iftypes = 0;
432
433                 c = &wiphy->iface_combinations[i];
434
435                 /* Combinations with just one interface aren't real */
436                 if (WARN_ON(c->max_interfaces < 2))
437                         return -EINVAL;
438
439                 /* Need at least one channel */
440                 if (WARN_ON(!c->num_different_channels))
441                         return -EINVAL;
442
443                 if (WARN_ON(!c->n_limits))
444                         return -EINVAL;
445
446                 for (j = 0; j < c->n_limits; j++) {
447                         u16 types = c->limits[j].types;
448
449                         /*
450                          * interface types shouldn't overlap, this is
451                          * used in cfg80211_can_change_interface()
452                          */
453                         if (WARN_ON(types & all_iftypes))
454                                 return -EINVAL;
455                         all_iftypes |= types;
456
457                         if (WARN_ON(!c->limits[j].max))
458                                 return -EINVAL;
459
460                         /* Shouldn't list software iftypes in combinations! */
461                         if (WARN_ON(wiphy->software_iftypes & types))
462                                 return -EINVAL;
463
464                         cnt += c->limits[j].max;
465                         /*
466                          * Don't advertise an unsupported type
467                          * in a combination.
468                          */
469                         if (WARN_ON((wiphy->interface_modes & types) != types))
470                                 return -EINVAL;
471                 }
472
473                 /* You can't even choose that many! */
474                 if (WARN_ON(cnt < c->max_interfaces))
475                         return -EINVAL;
476         }
477
478         return 0;
479 }
480
481 int wiphy_register(struct wiphy *wiphy)
482 {
483         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
484         int res;
485         enum ieee80211_band band;
486         struct ieee80211_supported_band *sband;
487         bool have_band = false;
488         int i;
489         u16 ifmodes = wiphy->interface_modes;
490
491         if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
492                 return -EINVAL;
493
494         if (WARN_ON(wiphy->addresses &&
495                     !is_zero_ether_addr(wiphy->perm_addr) &&
496                     memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
497                            ETH_ALEN)))
498                 return -EINVAL;
499
500         if (wiphy->addresses)
501                 memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
502
503         /* sanity check ifmodes */
504         WARN_ON(!ifmodes);
505         ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
506         if (WARN_ON(ifmodes != wiphy->interface_modes))
507                 wiphy->interface_modes = ifmodes;
508
509         res = wiphy_verify_combinations(wiphy);
510         if (res)
511                 return res;
512
513         /* sanity check supported bands/channels */
514         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
515                 sband = wiphy->bands[band];
516                 if (!sband)
517                         continue;
518
519                 sband->band = band;
520
521                 if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
522                         return -EINVAL;
523
524                 /*
525                  * Since cfg80211_disable_40mhz_24ghz is global, we can
526                  * modify the sband's ht data even if the driver uses a
527                  * global structure for that.
528                  */
529                 if (cfg80211_disable_40mhz_24ghz &&
530                     band == IEEE80211_BAND_2GHZ &&
531                     sband->ht_cap.ht_supported) {
532                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
533                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
534                 }
535
536                 /*
537                  * Since we use a u32 for rate bitmaps in
538                  * ieee80211_get_response_rate, we cannot
539                  * have more than 32 legacy rates.
540                  */
541                 if (WARN_ON(sband->n_bitrates > 32))
542                         return -EINVAL;
543
544                 for (i = 0; i < sband->n_channels; i++) {
545                         sband->channels[i].orig_flags =
546                                 sband->channels[i].flags;
547                         sband->channels[i].orig_mag =
548                                 sband->channels[i].max_antenna_gain;
549                         sband->channels[i].orig_mpwr =
550                                 sband->channels[i].max_power;
551                         sband->channels[i].band = band;
552                 }
553
554                 have_band = true;
555         }
556
557         if (!have_band) {
558                 WARN_ON(1);
559                 return -EINVAL;
560         }
561
562         if (rdev->wiphy.wowlan.n_patterns) {
563                 if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
564                             rdev->wiphy.wowlan.pattern_min_len >
565                             rdev->wiphy.wowlan.pattern_max_len))
566                         return -EINVAL;
567         }
568
569         /* check and set up bitrates */
570         ieee80211_set_bitrate_flags(wiphy);
571
572         mutex_lock(&cfg80211_mutex);
573
574         res = device_add(&rdev->wiphy.dev);
575         if (res) {
576                 mutex_unlock(&cfg80211_mutex);
577                 return res;
578         }
579
580         /* set up regulatory info */
581         wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
582
583         list_add_rcu(&rdev->list, &cfg80211_rdev_list);
584         cfg80211_rdev_list_generation++;
585
586         /* add to debugfs */
587         rdev->wiphy.debugfsdir =
588                 debugfs_create_dir(wiphy_name(&rdev->wiphy),
589                                    ieee80211_debugfs_dir);
590         if (IS_ERR(rdev->wiphy.debugfsdir))
591                 rdev->wiphy.debugfsdir = NULL;
592
593         if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
594                 struct regulatory_request request;
595
596                 request.wiphy_idx = get_wiphy_idx(wiphy);
597                 request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
598                 request.alpha2[0] = '9';
599                 request.alpha2[1] = '9';
600
601                 nl80211_send_reg_change_event(&request);
602         }
603
604         cfg80211_debugfs_rdev_add(rdev);
605         mutex_unlock(&cfg80211_mutex);
606
607         /*
608          * due to a locking dependency this has to be outside of the
609          * cfg80211_mutex lock
610          */
611         res = rfkill_register(rdev->rfkill);
612         if (res)
613                 goto out_rm_dev;
614
615         return 0;
616
617 out_rm_dev:
618         device_del(&rdev->wiphy.dev);
619         return res;
620 }
621 EXPORT_SYMBOL(wiphy_register);
622
623 void wiphy_rfkill_start_polling(struct wiphy *wiphy)
624 {
625         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
626
627         if (!rdev->ops->rfkill_poll)
628                 return;
629         rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
630         rfkill_resume_polling(rdev->rfkill);
631 }
632 EXPORT_SYMBOL(wiphy_rfkill_start_polling);
633
634 void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
635 {
636         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
637
638         rfkill_pause_polling(rdev->rfkill);
639 }
640 EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
641
642 void wiphy_unregister(struct wiphy *wiphy)
643 {
644         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
645
646         rfkill_unregister(rdev->rfkill);
647
648         /* protect the device list */
649         mutex_lock(&cfg80211_mutex);
650
651         wait_event(rdev->dev_wait, ({
652                 int __count;
653                 mutex_lock(&rdev->devlist_mtx);
654                 __count = rdev->opencount;
655                 mutex_unlock(&rdev->devlist_mtx);
656                 __count == 0;}));
657
658         mutex_lock(&rdev->devlist_mtx);
659         BUG_ON(!list_empty(&rdev->netdev_list));
660         mutex_unlock(&rdev->devlist_mtx);
661
662         /*
663          * First remove the hardware from everywhere, this makes
664          * it impossible to find from userspace.
665          */
666         debugfs_remove_recursive(rdev->wiphy.debugfsdir);
667         list_del_rcu(&rdev->list);
668         synchronize_rcu();
669
670         /*
671          * Try to grab rdev->mtx. If a command is still in progress,
672          * hopefully the driver will refuse it since it's tearing
673          * down the device already. We wait for this command to complete
674          * before unlinking the item from the list.
675          * Note: as codified by the BUG_ON above we cannot get here if
676          * a virtual interface is still present. Hence, we can only get
677          * to lock contention here if userspace issues a command that
678          * identified the hardware by wiphy index.
679          */
680         cfg80211_lock_rdev(rdev);
681         /* nothing */
682         cfg80211_unlock_rdev(rdev);
683
684         /* If this device got a regulatory hint tell core its
685          * free to listen now to a new shiny device regulatory hint */
686         reg_device_remove(wiphy);
687
688         cfg80211_rdev_list_generation++;
689         device_del(&rdev->wiphy.dev);
690
691         mutex_unlock(&cfg80211_mutex);
692
693         flush_work(&rdev->scan_done_wk);
694         cancel_work_sync(&rdev->conn_work);
695         flush_work(&rdev->event_work);
696 }
697 EXPORT_SYMBOL(wiphy_unregister);
698
699 void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
700 {
701         struct cfg80211_internal_bss *scan, *tmp;
702         rfkill_destroy(rdev->rfkill);
703         mutex_destroy(&rdev->mtx);
704         mutex_destroy(&rdev->devlist_mtx);
705         mutex_destroy(&rdev->sched_scan_mtx);
706         list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
707                 cfg80211_put_bss(&scan->pub);
708         cfg80211_rdev_free_wowlan(rdev);
709         kfree(rdev);
710 }
711
712 void wiphy_free(struct wiphy *wiphy)
713 {
714         put_device(&wiphy->dev);
715 }
716 EXPORT_SYMBOL(wiphy_free);
717
718 void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
719 {
720         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
721
722         if (rfkill_set_hw_state(rdev->rfkill, blocked))
723                 schedule_work(&rdev->rfkill_sync);
724 }
725 EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
726
727 static void wdev_cleanup_work(struct work_struct *work)
728 {
729         struct wireless_dev *wdev;
730         struct cfg80211_registered_device *rdev;
731
732         wdev = container_of(work, struct wireless_dev, cleanup_work);
733         rdev = wiphy_to_dev(wdev->wiphy);
734
735         cfg80211_lock_rdev(rdev);
736
737         if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) {
738                 rdev->scan_req->aborted = true;
739                 ___cfg80211_scan_done(rdev, true);
740         }
741
742         cfg80211_unlock_rdev(rdev);
743
744         mutex_lock(&rdev->sched_scan_mtx);
745
746         if (WARN_ON(rdev->sched_scan_req &&
747                     rdev->sched_scan_req->dev == wdev->netdev)) {
748                 __cfg80211_stop_sched_scan(rdev, false);
749         }
750
751         mutex_unlock(&rdev->sched_scan_mtx);
752
753         mutex_lock(&rdev->devlist_mtx);
754         rdev->opencount--;
755         mutex_unlock(&rdev->devlist_mtx);
756         wake_up(&rdev->dev_wait);
757
758         dev_put(wdev->netdev);
759 }
760
761 static struct device_type wiphy_type = {
762         .name   = "wlan",
763 };
764
765 static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
766                                          unsigned long state,
767                                          void *ndev)
768 {
769         struct net_device *dev = ndev;
770         struct wireless_dev *wdev = dev->ieee80211_ptr;
771         struct cfg80211_registered_device *rdev;
772         int ret;
773
774         if (!wdev)
775                 return NOTIFY_DONE;
776
777         rdev = wiphy_to_dev(wdev->wiphy);
778
779         WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
780
781         switch (state) {
782         case NETDEV_POST_INIT:
783                 SET_NETDEV_DEVTYPE(dev, &wiphy_type);
784                 break;
785         case NETDEV_REGISTER:
786                 /*
787                  * NB: cannot take rdev->mtx here because this may be
788                  * called within code protected by it when interfaces
789                  * are added with nl80211.
790                  */
791                 mutex_init(&wdev->mtx);
792                 INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
793                 INIT_LIST_HEAD(&wdev->event_list);
794                 spin_lock_init(&wdev->event_lock);
795                 INIT_LIST_HEAD(&wdev->mgmt_registrations);
796                 spin_lock_init(&wdev->mgmt_registrations_lock);
797
798                 mutex_lock(&rdev->devlist_mtx);
799                 list_add_rcu(&wdev->list, &rdev->netdev_list);
800                 rdev->devlist_generation++;
801                 /* can only change netns with wiphy */
802                 dev->features |= NETIF_F_NETNS_LOCAL;
803
804                 if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
805                                       "phy80211")) {
806                         pr_err("failed to add phy80211 symlink to netdev!\n");
807                 }
808                 wdev->netdev = dev;
809                 wdev->sme_state = CFG80211_SME_IDLE;
810                 mutex_unlock(&rdev->devlist_mtx);
811 #ifdef CONFIG_CFG80211_WEXT
812                 wdev->wext.default_key = -1;
813                 wdev->wext.default_mgmt_key = -1;
814                 wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
815 #endif
816
817                 if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
818                         wdev->ps = true;
819                 else
820                         wdev->ps = false;
821                 /* allow mac80211 to determine the timeout */
822                 wdev->ps_timeout = -1;
823
824                 if (!dev->ethtool_ops)
825                         dev->ethtool_ops = &cfg80211_ethtool_ops;
826
827                 if ((wdev->iftype == NL80211_IFTYPE_STATION ||
828                      wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
829                      wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
830                         dev->priv_flags |= IFF_DONT_BRIDGE;
831                 break;
832         case NETDEV_GOING_DOWN:
833                 switch (wdev->iftype) {
834                 case NL80211_IFTYPE_ADHOC:
835                         cfg80211_leave_ibss(rdev, dev, true);
836                         break;
837                 case NL80211_IFTYPE_P2P_CLIENT:
838                 case NL80211_IFTYPE_STATION:
839                         mutex_lock(&rdev->sched_scan_mtx);
840                         __cfg80211_stop_sched_scan(rdev, false);
841                         mutex_unlock(&rdev->sched_scan_mtx);
842
843                         wdev_lock(wdev);
844 #ifdef CONFIG_CFG80211_WEXT
845                         kfree(wdev->wext.ie);
846                         wdev->wext.ie = NULL;
847                         wdev->wext.ie_len = 0;
848                         wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
849 #endif
850                         __cfg80211_disconnect(rdev, dev,
851                                               WLAN_REASON_DEAUTH_LEAVING, true);
852                         cfg80211_mlme_down(rdev, dev);
853                         wdev_unlock(wdev);
854                         break;
855                 case NL80211_IFTYPE_MESH_POINT:
856                         cfg80211_leave_mesh(rdev, dev);
857                         break;
858                 default:
859                         break;
860                 }
861                 wdev->beacon_interval = 0;
862                 break;
863         case NETDEV_DOWN:
864                 dev_hold(dev);
865                 queue_work(cfg80211_wq, &wdev->cleanup_work);
866                 break;
867         case NETDEV_UP:
868                 /*
869                  * If we have a really quick DOWN/UP succession we may
870                  * have this work still pending ... cancel it and see
871                  * if it was pending, in which case we need to account
872                  * for some of the work it would have done.
873                  */
874                 if (cancel_work_sync(&wdev->cleanup_work)) {
875                         mutex_lock(&rdev->devlist_mtx);
876                         rdev->opencount--;
877                         mutex_unlock(&rdev->devlist_mtx);
878                         dev_put(dev);
879                 }
880                 cfg80211_lock_rdev(rdev);
881                 mutex_lock(&rdev->devlist_mtx);
882                 wdev_lock(wdev);
883                 switch (wdev->iftype) {
884 #ifdef CONFIG_CFG80211_WEXT
885                 case NL80211_IFTYPE_ADHOC:
886                         cfg80211_ibss_wext_join(rdev, wdev);
887                         break;
888                 case NL80211_IFTYPE_STATION:
889                         cfg80211_mgd_wext_connect(rdev, wdev);
890                         break;
891 #endif
892 #ifdef CONFIG_MAC80211_MESH
893                 case NL80211_IFTYPE_MESH_POINT:
894                         {
895                                 /* backward compat code... */
896                                 struct mesh_setup setup;
897                                 memcpy(&setup, &default_mesh_setup,
898                                                 sizeof(setup));
899                                  /* back compat only needed for mesh_id */
900                                 setup.mesh_id = wdev->ssid;
901                                 setup.mesh_id_len = wdev->mesh_id_up_len;
902                                 if (wdev->mesh_id_up_len)
903                                         __cfg80211_join_mesh(rdev, dev,
904                                                         &setup,
905                                                         &default_mesh_config);
906                                 break;
907                         }
908 #endif
909                 default:
910                         break;
911                 }
912                 wdev_unlock(wdev);
913                 rdev->opencount++;
914                 mutex_unlock(&rdev->devlist_mtx);
915                 cfg80211_unlock_rdev(rdev);
916
917                 /*
918                  * Configure power management to the driver here so that its
919                  * correctly set also after interface type changes etc.
920                  */
921                 if (wdev->iftype == NL80211_IFTYPE_STATION &&
922                     rdev->ops->set_power_mgmt)
923                         if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
924                                                       wdev->ps,
925                                                       wdev->ps_timeout)) {
926                                 /* assume this means it's off */
927                                 wdev->ps = false;
928                         }
929                 break;
930         case NETDEV_UNREGISTER:
931                 /*
932                  * NB: cannot take rdev->mtx here because this may be
933                  * called within code protected by it when interfaces
934                  * are removed with nl80211.
935                  */
936                 mutex_lock(&rdev->devlist_mtx);
937                 /*
938                  * It is possible to get NETDEV_UNREGISTER
939                  * multiple times. To detect that, check
940                  * that the interface is still on the list
941                  * of registered interfaces, and only then
942                  * remove and clean it up.
943                  */
944                 if (!list_empty(&wdev->list)) {
945                         sysfs_remove_link(&dev->dev.kobj, "phy80211");
946                         list_del_rcu(&wdev->list);
947                         rdev->devlist_generation++;
948                         cfg80211_mlme_purge_registrations(wdev);
949 #ifdef CONFIG_CFG80211_WEXT
950                         kfree(wdev->wext.keys);
951 #endif
952                 }
953                 mutex_unlock(&rdev->devlist_mtx);
954                 /*
955                  * synchronise (so that we won't find this netdev
956                  * from other code any more) and then clear the list
957                  * head so that the above code can safely check for
958                  * !list_empty() to avoid double-cleanup.
959                  */
960                 synchronize_rcu();
961                 INIT_LIST_HEAD(&wdev->list);
962                 break;
963         case NETDEV_PRE_UP:
964                 if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
965                         return notifier_from_errno(-EOPNOTSUPP);
966                 if (rfkill_blocked(rdev->rfkill))
967                         return notifier_from_errno(-ERFKILL);
968                 ret = cfg80211_can_add_interface(rdev, wdev->iftype);
969                 if (ret)
970                         return notifier_from_errno(ret);
971                 break;
972         }
973
974         return NOTIFY_DONE;
975 }
976
977 static struct notifier_block cfg80211_netdev_notifier = {
978         .notifier_call = cfg80211_netdev_notifier_call,
979 };
980
981 static void __net_exit cfg80211_pernet_exit(struct net *net)
982 {
983         struct cfg80211_registered_device *rdev;
984
985         rtnl_lock();
986         mutex_lock(&cfg80211_mutex);
987         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
988                 if (net_eq(wiphy_net(&rdev->wiphy), net))
989                         WARN_ON(cfg80211_switch_netns(rdev, &init_net));
990         }
991         mutex_unlock(&cfg80211_mutex);
992         rtnl_unlock();
993 }
994
995 static struct pernet_operations cfg80211_pernet_ops = {
996         .exit = cfg80211_pernet_exit,
997 };
998
999 static int __init cfg80211_init(void)
1000 {
1001         int err;
1002
1003         err = register_pernet_device(&cfg80211_pernet_ops);
1004         if (err)
1005                 goto out_fail_pernet;
1006
1007         err = wiphy_sysfs_init();
1008         if (err)
1009                 goto out_fail_sysfs;
1010
1011         err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1012         if (err)
1013                 goto out_fail_notifier;
1014
1015         err = nl80211_init();
1016         if (err)
1017                 goto out_fail_nl80211;
1018
1019         ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1020
1021         err = regulatory_init();
1022         if (err)
1023                 goto out_fail_reg;
1024
1025         cfg80211_wq = create_singlethread_workqueue("cfg80211");
1026         if (!cfg80211_wq)
1027                 goto out_fail_wq;
1028
1029         return 0;
1030
1031 out_fail_wq:
1032         regulatory_exit();
1033 out_fail_reg:
1034         debugfs_remove(ieee80211_debugfs_dir);
1035 out_fail_nl80211:
1036         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1037 out_fail_notifier:
1038         wiphy_sysfs_exit();
1039 out_fail_sysfs:
1040         unregister_pernet_device(&cfg80211_pernet_ops);
1041 out_fail_pernet:
1042         return err;
1043 }
1044 subsys_initcall(cfg80211_init);
1045
1046 static void __exit cfg80211_exit(void)
1047 {
1048         debugfs_remove(ieee80211_debugfs_dir);
1049         nl80211_exit();
1050         unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1051         wiphy_sysfs_exit();
1052         regulatory_exit();
1053         unregister_pernet_device(&cfg80211_pernet_ops);
1054         destroy_workqueue(cfg80211_wq);
1055 }
1056 module_exit(cfg80211_exit);